WO2020195837A1

WO2020195837A1 - Speaker and method for manufacturing speaker

Info

Publication number: WO2020195837A1
Application number: PCT/JP2020/010551
Authority: WO
Inventors: 真己新免; 航也野本; 剛五十嵐; 貴成起田
Original assignee: ソニー株式会社
Priority date: 2019-03-25
Filing date: 2020-03-11
Publication date: 2020-10-01
Also published as: US20220167090A1; US11985492B2; JPWO2020195837A1; CN113597775A; KR20210145729A; EP3952337A4; EP3952337A1

Abstract

An objective of the present invention is to provide a speaker having a powerful magnetic circuit and a method for manufacturing a speaker. To achieve this objective, a speaker according to one aspect of the present technology is provided with an outer magnet and an inner magnet. The outer magnet has a ring shape and is magnetized along an axial direction of the ring shape. The inner magnet has a circular outer shape as seen from the axial direction of the outer magnet, is magnetized in the opposite direction of the outer magnet along the axial direction, and is disposed inside the outer magnet with a gap therebetween.

Description

Speakers and speaker manufacturing methods

This technology relates to speakers and speaker manufacturing methods.

Conventionally, an internal magnetic type speaker and an external magnetic type speaker are known as small speakers used for headphones and the like. For example, FIGS. 1, 5 and 6 of Patent Document 1 show an internal magnetic speaker. An external magnetic speaker is illustrated in FIGS. 4 and 7 of Patent Document 1. Of these, the permanent magnets of the internal magnetic speaker shown in FIGS. 1 and 5 and the external magnetic speaker shown in FIG. 4 are divided into a plurality of permanent magnets and formed by a transverse magnetic field pressing method. As a result, the magnetic characteristics of the permanent magnet are improved, and a strong and efficient magnetic circuit is realized (paragraphs [0022] [0034] of the specification of Patent Document 1 and the like).

Further, in FIGS. 4, 5, 7 to 10 of Patent Document 2, an external magnetic speaker is illustrated. In this external magnetic speaker, a conductor portion, which is a structure having a lower electrical resistivity than the magnetic material constituting the magnetic circuit, is arranged in the vicinity of the voice coil of the driver unit. Then, an electromagnetic induction coupling is generated between the voice coil and the conductor portion, whereby the inductance of the voice coil is reduced. As a result, a good noise canceling effect is realized (paragraphs [0040] to [0047] of the specification of Patent Document 2 and the like).

Japanese Unexamined Patent Publication No. 2005-31149 Japanese Unexamined Patent Publication No. 2008-187456

In this way, technologies for improving speaker performance have been developed, and new technologies that enable the realization of powerful magnetic circuits are required.

In view of the above circumstances, the purpose of this technique is to provide a speaker having a strong magnetic circuit and a method for manufacturing the speaker.

In order to achieve the above object, the speaker according to one embodiment of the present technology includes an outer magnet and an inner magnet.
The outer magnet has a ring shape and is magnetized along the axial direction of the ring shape.
The inner magnet has a circular outer shape when viewed from the axial direction of the outer magnet, is magnetized in the direction opposite to the outer magnet along the axial direction, and is arranged inside the outer magnet through a gap. Will be done.

In this speaker, an inner magnet magnetized in the opposite direction to the outer magnet is arranged inside the ring-shaped outer magnet through a gap. This makes it possible to realize a speaker having a strong magnetic circuit.

The inner magnet may have a ring shape having an axial direction equal to that of the outer magnet.

The speaker further includes an outer component portion, an inner component portion, and a diaphragm component portion. The outer component portion includes the outer magnet.
The inner component portion includes the inner magnet and forms a magnetic gap with the outer component portion.
The diaphragm component portion includes a coil arranged in the magnetic gap and a diaphragm.

The outer component portion may have an opening that opens orthogonal to the axial direction and has a diameter larger than the outer diameter of the inner magnet. In this case, the inner magnet may be inserted into and fixed to the opening.

In the axial direction, assuming that the side to which the diaphragm component is connected to the outer component is the first side and the side opposite to the first side is the second side, the opening is , May be configured on the second side of the outer component portion.

The lead wire of the coil may be pulled out through the opening.

The position of the central axis of the outer magnet, the position of the central axis of the inner magnet, and the position of the central axis of the coil may be equal to each other. In this case, the inner component portion may be formed with a through hole extending along the axial direction at the position of the central axis of the inner magnet.

In the axial direction, assuming that the side to which the diaphragm component is connected to the outer component is the first side and the side opposite to the first side is the second side, the inner component May have an inner yoke that is magnetically connected to the second side of the inner magnet.

The inner yoke may have a first portion corresponding to the coil and a second portion corresponding to the inner magnet when viewed from the axial direction. In this case, the thickness of the first portion may be smaller than the thickness of the second portion.

The outer component portion may have an outer yoke that is magnetically connected to the second side of the outer magnet.

The inner yoke and the outer yoke may be connected by welding.

The diaphragm component portion may have a support magnet that supports the diaphragm and is magnetized in the direction opposite to that of the outer magnet along the axial direction.

The speaker manufacturing method according to one embodiment of the present technology includes the following steps.
A step of forming an outer component portion having a ring shape and including an outer magnet magnetized along the axial direction of the ring shape.
A step of forming an inner component portion having a circular outer shape having a diameter smaller than the inner diameter of the outer magnet and including an inner magnet magnetized along the axial direction of the circular shape.
The outer component is arranged so that the inner magnet is arranged inside the outer magnet through a gap, and the magnetizing direction of the outer magnet and the magnetizing direction of the inner magnet are opposite to each other. The step of assembling the part and the inner part part.

The inner magnet may have a ring shape having a diameter smaller than that of the outer magnet. In this case, the step of forming the inner component portion may include a step of forming a through hole so as to extend along the axial direction at the position of the central axis of the inner magnet.

The step of assembling the outer component portion and the inner component portion is performed in the opening of the outer component portion formed on the side opposite to the side to which the diaphragm component portion including the coil and the diaphragm is connected. It may include a step of inserting a magnet.

The step of assembling the outer component portion and the inner component portion is performed by a jig for making the axial direction of the outer magnet equal to the axial direction of the inner magnet, and at least one of the outer component portion or the inner component portion. May include steps to support.

The method for manufacturing the speaker further describes.
Steps to form the diaphragm parts including the coil and diaphragm,
The outer component portion, the inner component portion, and the step of assembling the diaphragm component portion are provided so that the coil is arranged in the magnetic gap between the outer component portion and the inner component portion. You may.

The speaker manufacturing method may further include a step of forming a diaphragm component including a coil and a diaphragm. In this case, the steps for forming the outer component portion include the step of assembling the unmagnetized outer component portion and the diaphragm component portion, and the unmagnetized outer component portion and the diaphragm component portion. After the step of assembling, the step of magnetizing the unmagnetized outer magnet may be included. Further, in the step of assembling the outer component portion and the inner component portion, the diaphragm component portion was assembled so that the coil is arranged in the magnetic gap between the outer component portion and the inner component portion. The step of assembling the inner part may be included with respect to the outer part.

The step of forming the outer component portion is between the step of assembling the unmagnetized outer component portion and the diaphragm component portion and the step of magnetizing the unmagnetized outer magnet. The step of fixing the leader wire of the coil of the diaphragm component portion by soldering may be included.

Assuming that the side to which the diaphragm component is connected to the outer component is the first side and the side opposite to the first side is the second side, the step of forming the outer component is , The step of arranging the outer yoke on the second side of the outer magnet may be included. In this case, the step of forming the inner component portion may include a step of arranging the inner yoke on the second side of the inner magnet. Further, the step of assembling the outer component portion and the inner component portion may include a step of connecting the outer yoke and the inner yoke by welding.

It is a schematic cross-sectional view which shows the structural example of the speaker which concerns on 1st Embodiment. It is a schematic cross-sectional view which showed each of the outer assembly, the inner assembly, and the diaphragm assembly included in a speaker individually. It is a schematic diagram which shows the positional relationship of the outer magnet, the inner magnet, and the voice coil included in a speaker as seen from the axial direction of a reference axis. It is a schematic diagram for demonstrating an example of the manufacturing method of a speaker. It is a schematic diagram for demonstrating an example of the manufacturing method of a speaker. It is a schematic diagram for demonstrating an example of the manufacturing method of a speaker. It is a schematic diagram for demonstrating an example of the manufacturing method of a speaker. It is a schematic cross-sectional view which shows the structural example of the speaker which concerns on 2nd Embodiment. It is a schematic cross-sectional view which showed each of the outer assembly, the inner assembly, and the diaphragm assembly included in a speaker individually. It is a schematic diagram which shows the distribution of the magnetic flux density in a magnetic gap. It is a schematic cross-sectional view which shows the structural example of the speaker which concerns on other embodiment. It is a schematic diagram which shows the distribution of the magnetic flux density in a magnetic gap. It is a schematic diagram which shows the structural example of the speaker unit which concerns on other embodiment.

Hereinafter, embodiments relating to the present technology will be described with reference to the drawings.

<First Embodiment>
[Speaker configuration]
FIG. 1 is a schematic cross-sectional view showing a configuration example of a speaker according to a first embodiment of the present technology. A speaker is a device that outputs audio by being driven by an amplified output of an audio signal so as to emit audio into space, and can also be called a driver.

The speaker 100 according to the present embodiment has a cylindrical shape as an overall outline. The cross-sectional view shown in FIG. 1 is a cross-sectional view when the diameter (diameter) of the speaker 100 is crossed along the axial direction of the central axis of the cylindrical shape. Hereinafter, the central axis of the speaker 100 will be referred to as a reference axis C.

FIG. 2 is a schematic cross-sectional view showing each of the outer assembly 10, the inner assembly 30, and the diaphragm assembly 50 included in the speaker 100 individually. FIG. 3 is a schematic view showing the positional relationship of the outer magnet (outer magnet) 12, the inner magnet (inner magnet) 31, and the voice coil 52 included in the speaker 100 as viewed from the axial direction of the reference axis C.

Hereinafter, a configuration example of the speaker 100 according to the present embodiment will be described with reference to FIGS. 1 to 3.

In the following description, for convenience, the axial direction of the reference axis C shown in FIG. 1 will be described as the vertical direction. Then, each member is expressed as an upper side of the member or a lower side of the member. Of course, the direction in which the speaker 100 is used is not limited, and the axial direction of the reference axis C can be set to any direction.

As shown in FIGS. 1 and 2, the speaker 100 has an outer assembly 10, an inner assembly 30, and a diaphragm assembly 50. In this embodiment, each assembly is configured with reference to reference C.

Outer Assembly The outer assembly 10 has a housing 11, an outer magnet 12, an outer plate 13, and a terminal plate 14.

The housing 11 has a cylindrical shape with an opening on the upper side, and is formed so that the reference axis C is the central axis. The housing 11 has a side surface portion 15 and a bottom surface portion 16. The side surface portion 15 is formed so as to surround the reference axis C, and extends along the axial direction of the reference axis C.

The bottom surface portion 16 is connected to the lower side of the side surface portion 15 and is formed along a direction orthogonal to the axial direction of the reference axis C. Further, a circular opening 17 centered on the position of the reference axis C is formed in the central portion of the bottom surface portion 16. The opening 17 opens orthogonally to the axial direction of the reference axis C.

The housing 11 is a non-magnetic material and is formed of any non-magnetic material such as plastic.

As shown in FIG. 3, the outer magnet 12 has a ring shape (annular shape) and is formed so that the reference axis C is the central axis. Therefore, the axial direction of the ring shape of the outer magnet 12 is equal to the axial direction of the reference axis C.

As shown in FIGS. 1 and 2, the outer magnet 12 is inside the side surface portion 15 of the housing 11 and is arranged on the upper side of the bottom surface portion 16. Therefore, the outer magnet 12 is supported by the housing 11 so that the outer peripheral side is surrounded by the housing 11.

The inner diameter of the outer magnet 12 is larger than the diameter of the opening 17 formed in the bottom surface portion 16. The outer diameter of the outer magnet 12 is smaller than the outer diameter of the bottom surface portion 16. Therefore, when viewed from the axial direction of the reference axis C, the outer magnet 12 is arranged so as to fit inside the bottom surface portion 16 of the housing 11.

Further, as shown in FIGS. 1 and 2, the outer magnet 12 is magnetized along the axial direction of the ring shape, that is, the axial direction of the reference axis C. In the present embodiment, the outer magnet 12 is magnetized so that the upper side has an S pole and the lower side has an N pole.

As the outer magnet 12, for example, a permanent magnet made of an arbitrary magnetic material such as a ferrite magnet, an alnico magnet, or a neodymium magnet can be used.

The outer plate 13 has a ring shape and is formed so that the reference axis C is the central axis. The outer plate 13 is arranged above the outer magnet 12. The inner diameter of the outer plate 13 is smaller than the inner diameter of the outer magnet 12, and the outer diameter of the outer plate 13 is larger than the outer diameter of the outer magnet 12. Therefore, when viewed from the axial direction of the reference axis C, the outer plate 13 is arranged so as to cover the entire upper surface of the outer magnet 12.

The outer plate 13 is a soft magnetic material and is formed of any soft magnetic material such as iron. Therefore, the outer plate 13 is magnetically connected to the outer magnet 12. The outer plate 13 is arranged for magnetic induction and functions as a component constituting a magnetic circuit. That is, the outer plate 13 functions as a yoke.

The terminal plate 14 has a ring shape and is formed so that the reference axis C is the central axis. The terminal plate 14 is connected to the lower side of 16 on the bottom surface of the housing 11. The inner diameter of the terminal plate 14 is larger than the diameter of the opening 17 formed in the bottom surface portion 16. Therefore, the terminal plate 14 does not block the opening 17.

The terminal plate 14 has a function of fastening the lead wire when the lead wire of the voice coil 52 of the diaphragm assembly 50 is pulled out to the outside. Note that in FIGS. 1 and 2, the drawing of the lead wire of the voice coil 52 is omitted. The lead wire of the voice coil 52 will be described later.

The inner assembly 30 has an inner magnet 31, a pole piece 32, and an inner yoke 33.

As shown in FIG. 3, the inner magnet 31 has a ring shape and is formed so that the reference axis C is the central axis. Therefore, the axial direction of the ring shape of the inner magnet 31 is equal to the axial direction of the reference axis C. As a result, the axial direction of the outer magnet 12 and the axial direction of the inner magnet 31 become equal to each other.

The outer shape of the inner magnet 31 (the shape of the outer peripheral surface 31a) is circular when viewed from the axial direction of the reference shaft C. The outer diameter of the inner magnet 31 is smaller than the diameter of the opening 17 formed in the bottom surface 16 of the outer assembly 10. Therefore, the outer diameter of the inner magnet 31 is smaller than the inner diameter of the outer magnet 12 of the outer assembly 10. As shown in FIGS. 1 and 3, the inner magnet 31 is arranged inside the outer magnet 12 via the gap G1. The width of the gap G1 is designed to be uniform over the entire circumference of the reference axis C.

Further, in the present embodiment, the thickness of the outer magnet 12 and the thickness of the inner magnet 31 are designed to be equal to each other in the vertical direction. Further, in the vertical direction, the position of the outer magnet 12 and the position of the inner magnet 31 are designed to be equal to each other.

That is, in the vertical direction, the upper surface of the outer magnet 12 and the upper surface of the inner magnet 31 are at equal positions. Further, in the vertical direction, the lower surface of the outer magnet 12 and the lower surface of the inner magnet 31 are at equal positions with each other. Of course, it is not limited to such a configuration.

Further, as shown in FIGS. 1 and 2, the inner magnet 31 is magnetized along the axial direction of the ring shape, that is, the axial direction of the reference axis C. In this embodiment, the inner magnet 31 is magnetized in the direction opposite to that of the outer magnet 12. That is, the inner magnet 31 is magnetized so that the upper side becomes the north pole and the lower side becomes the south pole.

As the inner magnet 31, it is possible to use a permanent magnet made of an arbitrary magnetic material such as a ferrite magnet, an alnico magnet, or a neodymium magnet. As the inner magnet 31, a permanent magnet of the same type as the outer magnet 12 may be used, or a different type of permanent magnet may be used.

The pole piece 32 has a ring shape and is formed so that the reference axis C is the central axis. The pole piece 32 is arranged on the upper side of the inner magnet 31. The outer diameter of the pole piece 32 is larger than the outer diameter of the inner magnet 31 and smaller than the diameter of the opening 17 of the outer assembly 10. The inner diameter of the pole piece 32 is the same size as the inner diameter of the inner magnet 31.

In the present embodiment, the thickness of the pole piece 32 and the thickness of the outer plate 13 of the outer assembly 10 are designed to be equal to each other in the vertical direction. Further, in the vertical direction, the position of the pole piece 32 and the position of the outer plate 13 are designed to be equal to each other.

That is, in the vertical direction, the upper surface of the pole piece 32 and the upper surface of the outer plate 13 are at equal positions with each other. Further, in the vertical direction, the lower surface of the pole piece 32 and the lower surface of the outer plate 13 are at equal positions with each other. Of course, it is not limited to such a configuration.

The pole piece 32 is a soft magnetic material and is formed of any soft magnetic material such as iron. Therefore, the pole piece 32 is magnetically connected to the inner magnet 31. The pole piece 32 is arranged for magnetic induction and functions as a component constituting a magnetic circuit. That is, the pole piece 32 functions as a yoke.

The inner yoke 33 has a ring shape and is formed so that the reference axis C is the central axis. The inner yoke 33 is arranged below the inner magnet 31. The outer diameter of the inner yoke 33 is larger than the diameter of the opening 17 of the outer assembly 10. Therefore, the outer diameter of the inner yoke 33 is larger than the outer diameter of the inner magnet 31.

As shown in FIG. 1, the inner yoke 33 is connected to the bottom surface portion 16 of the housing 11 of the outer assembly 10. Specifically, the bottom surface portion 16 and the inner yoke 33 are connected so as to close the opening 17 formed in the bottom surface portion 16.

In the present embodiment, a connecting portion 34 connected to the bottom surface portion 16 (opening 17) is formed on the outer peripheral portion of the inner yoke 33. For example, a step, a C surface, or the like is formed as a connecting portion 34. As a result, it is possible to improve the accuracy of alignment between the outer assembly 10 and the inner assembly 30, and it is possible to secure the coaxiality. Of course, instead of or in addition to the outer peripheral portion of the inner yoke 33, a connecting portion may be formed in the bottom surface portion 16 (opening portion 17).

The inner diameter of the inner yoke 33 is the same size as the inner diameter of the inner magnet 31. Therefore, the hole at the center of the inner magnet 31, the pole piece 32, and the inner yoke 33 constitutes a through hole 35 extending along the axial direction at the position of the central axis of the inner magnet 31 (the position of the reference axis C). Will be done.

The inner yoke 33 is a soft magnetic material and is formed of any soft magnetic material such as iron. Therefore, the inner yoke 33 is magnetically connected to the inner magnet 31. The inner yoke 33 is arranged for magnetic induction and functions as a component constituting a magnetic circuit.

The diaphragm assembly 50 has a diaphragm 51, a voice coil 52, and a diaphragm ring 53. The diaphragm 51 has a function of vibrating by the amplified output of the audio signal and radiating sound waves into the space. The diaphragm 51 is also called a diaphragm.

The diaphragm 51 has a circular outer shape centered on the position of the reference axis C when viewed from the reference axis C. The diaphragm 51 is formed of any easily deformable material such as PET (polyethylene terephthalate) or a liquid crystal polymer.

The voice coil 52 is connected to the diaphragm 51 and vibrates the diaphragm 51 based on the amplified output of the voice signal. The voice coil 52 has a cylindrical shape and is formed so that the reference axis C is the central axis. As shown in FIG. 3, the voice coil 52 is located on the gap G1 between the outer magnet 12 and the inner magnet 31 when viewed from the axial direction of the reference axis C. The number of turns of the voice coil 52, the material of the wire rod, and the like are not limited, and any configuration may be adopted.

The diaphragm ring 53 is used as a member that supports the diaphragm 51. By providing the diaphragm ring 53, it is possible to improve the handling with respect to the diaphragm 51. The diaphragm ring 53 has a ring shape and is formed so that the reference axis C is the central axis. The diaphragm ring 53 is connected to the diaphragm 51 so as to support the peripheral edge of the diaphragm 51.

Further, as shown in FIG. 1, the diaphragm ring 53 is connected to the upper side of the housing 11 of the outer assembly 10. In this embodiment, any non-magnetic material such as brass is used as the diaphragm ring 53. It is also possible to make the diaphragm ring 53 function as a spacer.

In the present embodiment, the outer assembly 10 and the inner assembly 30 are assembled to form a magnetic circuit. Specifically, a magnetic circuit is configured by the outer magnet 12 and the outer plate 13 of the outer assembly 10, the inner magnet 31, the pole piece 32, and the inner yoke 33 of the inner assembly 30.

A magnetic gap is formed between the outer assembly 10 and the inner assembly 30. Specifically, the gap G1 between the outer magnet 12 and the inner magnet 31 and the gap G2 between the outer plate 13 and the pole piece 32 function as a magnetic gap. The diaphragm assembly 50 is assembled so that the voice coil 52 is arranged between the magnetic gaps.

In the present embodiment, each member of the outer assembly 10, each member of the inner assembly 30, and each member of the diaphragm assembly 50 are coaxially configured with reference to the reference axis C. Therefore, as shown in FIG. 3, the position of the central axis of the outer magnet 12, the position of the central axis of the inner magnet 31, and the position of the central axis of the voice coil 52 are configured to be equal to each other.

Further, as shown in FIG. 3, when viewed from the axial direction of the reference axis C, the outer peripheral surface 12a and the inner peripheral surface 12b of the outer magnet 12, the outer peripheral surface 52a and the inner peripheral surface 52b of the voice coil 52, and the outer peripheral surface of the inner magnet 31. The 31a and the inner peripheral surface 31b are concentric circles with each other. By sandwiching the voice coil 52 between the two permanent magnets of the outer magnet 12 and the inner magnet 31, it is possible to form a very strong magnetic circuit.

On the lower side of the center of the diaphragm 51 of the diaphragm assembly 50, a through hole 35 formed in the inner assembly 30 and extending along the axial direction is located. As a result, the back pressure of the diaphragm 51 can be discharged from the inside of the speaker 100, and the acoustic characteristics can be improved.

Further, as shown in FIG. 1, in the present embodiment, the inner yoke 33 of the inner assembly 30 has a first portion 33a corresponding to the lower side of the voice coil 52 and a second portion 33b corresponding to the lower side of the inner magnet 31. Is regulated. The thickness of the first portion 33a is designed to be smaller than the thickness of the second portion 33b. This is a configuration found by paying attention to the fact that the first portion 33a is less likely to be magnetically saturated than the second portion 33b.

By reducing the thickness of the first portion 33a corresponding to the voice coil 52, the range of motion of the voice coil 52 can be increased, and the acoustic characteristics can be improved.

Note that the application of this technology is not limited to the configurations illustrated in FIGS. 1 to 3. Further, in the present disclosure, the circular shape includes not only a perfect circular shape but also an elliptical shape and the like. For example, the present technology can be applied even when the shapes of the outer magnet 12, the voice coil 52, and the inner magnet 31 as viewed from the reference axis C are any other shapes such as an elliptical shape.

In this embodiment, the outer assembly 10 corresponds to the outer component portion. The inner assembly 30 corresponds to the inner component portion. The diaphragm assembly 50 corresponds to a diaphragm component portion. Each component part can also be called a unit or module.

Further, in the present embodiment, the voice coil 52 corresponds to a coil. Further, the upper side corresponds to the first side, which is the side to which the diaphragm component portion is connected to the outer component portion. The lower side corresponds to the second side opposite to the first side. Further, the first portion 33a of the inner yoke 33 is a portion corresponding to the voice coil 52 when viewed from the axial direction of the reference axis C. The second portion 33b of the inner yoke 33 is a portion corresponding to the inner magnet 31 when viewed from the axial direction of the reference axis C. It is also possible to say that the first portion and the second portion are a portion overlapping the voice coil 52 and a portion overlapping the inner magnet 31 when viewed from the axial direction of the reference axis C.

Further, the outer assembly 10 and the inner assembly 30 can also be referred to as an outer magnetic circuit assembly and an inner magnetic circuit assembly. Further, when the speaker 100 itself is regarded as an assembly, the outer assembly 10, the inner assembly 30, and the diaphragm assembly 50 can be regarded as sub-assemblies. For example, the outer assembly 10, the inner assembly 30, and the diaphragm assembly 50 can be referred to as an outer magnetic circuit sub-assembly, an inner magnetic circuit sub-assembly, and a diaphragm sub-assembly.

[Speaker manufacturing method]
4 to 7 are schematic views for explaining an example of a method for manufacturing the speaker 100.

As shown in FIG. 4A, the housing 11, the ferromagnetic material 20, and the outer plate 13 are assembled with reference to the reference axis C. The ferromagnet 20 is a component that becomes the outer magnet 12 shown in FIG. 1 and the like by magnetizing. Hereinafter, a ferromagnet that functions as a permanent magnet by being magnetized will be referred to as a magnet in an unmagnetized state. Therefore, hereinafter, the ferromagnetic material 20 shown in FIG. 4 will be referred to as an unmagnetized outer magnet 20 using the same reference numerals.

The method of assembling each member is not limited. Any connection method depending on the material of the member, such as adhesion using an adhesive, welding, joining using screws, etc., may be adopted. This also applies to the following assembly steps.

As shown in FIG. 4B, the terminal plate 14 is connected to the lower side of the housing 11. As a result, a configuration in which the outer magnet 12 is not magnetized as compared with the outer assembly 10 shown in FIG. 2B is realized.

Hereinafter, the assembly incorporating the outer magnet 20 in the unmagnetized state shown in FIG. 4B will be referred to as the outer assembly 25 in the unmagnetized state. Therefore, FIG. 4B can be said to be a diagram of the steps in which the unmagnetized outer assembly 25 is formed.

For example, the unmagnetized outer magnet 20 is magnetized with respect to the unmagnetized outer assembly 25 shown in FIG. 4B. As a result, the step of forming the outer assembly 10 according to the present embodiment is completed.

Of the outer plate 13 made of a soft magnetic material and the unmagnetized outer magnet 20 made of a ferromagnetic material, the unmagnetized outer magnet 20 often has lower processing accuracy. Therefore, the outer dimensions of the outer plate 13 are designed to be larger than the outer dimensions of the unmagnetized outer magnet 20 when viewed from the axial direction of the reference axis C. This makes it possible to improve the workability of the step of forming the outer assembly 25 in the unmagnetized state.

The terminal plate 14 may be provided in another assembly. The terminal plate 14 may be provided at any position as long as it does not affect the assembly of the inner assembly 30. For example, it is possible to form the terminal plate 14 on the side surface of the housing 11 with a flexible substrate or the like.

As a step different from the step of forming the outer assembly 25 in the unmagnetized state, the diaphragm assembly 50 shown in FIG. 2A is formed. That is, the diaphragm ring 53 is connected to the diaphragm 51. Further, the voice coil 52 is connected to the diaphragm 51. The specific method for forming the diaphragm assembly 50 is not limited, and any method may be adopted.

As shown in FIG. 5A, the unmagnetized outer assembly 25 and the diaphragm assembly 50 are assembled. Specifically, the diaphragm ring 53 of the diaphragm assembly 50 is connected to the upper side of the housing 11 with reference to the reference shaft C.

As shown in FIG. 5B, the lead wire 55 of the voice coil 52 of the diaphragm assembly 50 is pulled out through the opening 17 of the outer assembly 25 in the unmagnetized state. Then, the lead wire 55 is fixed to the terminal plate 14 by soldering.

As shown in FIG. 5C, the unmagnetized outer magnet 20 is magnetized along the axial direction of the reference axis C. As a result, the outer magnet 12 shown in FIGS. 1 and 2 is realized. Further, the outer assembly 10 shown in FIGS. 1 and 2 is realized.

That is, in the present embodiment, the step of forming the outer assembly 10 is
The step of assembling the unmagnetized outer assembly 25 and the diaphragm assembly 50,
A step of fixing the leader wire 55 of the voice coil 52 of the diaphragm assembly 50 by soldering, and
The steps of magnetizing the unmagnetized outer magnet 20 are included in this order.

Since it is possible to solder the lead wire 55 before magnetizing the outer magnet 12 (when the outer magnet 20 is in the unmagnetized state), it is possible to greatly improve the workability of soldering. Become.

The inner assembly 30 shown in FIG. 2C is formed as a step different from the steps described with reference to FIGS. 4 and 5. That is, the inner magnet 31, the pole piece 32, and the inner yoke 33 are assembled with reference to the reference axis C.

In the present embodiment, in the step of forming the inner assembly 30, an inner magnet 31 having a ring shape having a diameter smaller than that of the outer magnet 12 is prepared. Then, a through hole 35 is formed at the position of the central axis of the inner magnet 31 so as to extend along the axial direction. Specifically, the inner magnet 31, the pole piece 32, and the inner yoke 33 having a ring shape having the same inner diameter are assembled so that their central axes are at the same position. As a result, the through hole 35 is formed.

Note that the case is not limited to the case where the inner magnet 31, the pole piece 32, and the inner yoke 33 all have a ring shape having the same inner diameter. Even if the inner diameters of the parts are not equal, it is possible to form a through hole extending along the axial direction at the position of the reference axis C.

Further, in the pole piece 32 made of a soft magnetic material and the inner magnet 31 made of a ferromagnetic material, the inner magnet 31 often has lower processing accuracy. Therefore, the external dimensions of the pole piece 32 are designed to be larger than the external dimensions of the inner magnet 31 when viewed from the axial direction of the reference axis C. This makes it possible to improve the workability of the step of forming the inner assembly 30.

As shown in FIGS. 6 and 7, the outer assembly 10 and the inner assembly 30 are assembled. In the present embodiment, the inner assembly 30 is assembled with respect to the outer assembly 10 in which the diaphragm assembly 50 is assembled.

In the outer assembly 10 and the inner assembly 30, the inner magnet 31 is arranged inside the outer magnet 12 via the gap G1, and the magnetizing direction of the outer magnet 12 and the magnetizing direction of the inner magnet 31 are opposite to each other. Assembled in the opposite direction. Further, the outer assembly 10 and the inner assembly 30 are assembled so that the voice coil 52 is arranged in the magnetic gap between the outer assembly 10 and the inner assembly 30.

As shown in FIG. 6, in the present embodiment, a jig 60 for making the axial direction of the outer magnet 12 equal to the axial direction of the inner magnet 31 is used. The jig 60 can be said to be a device for guaranteeing that the outer assembly 10 and the inner assembly 30 are coaxial (coaxiality).

As shown in FIG. 6, the inner assembly 30 is supported by the jig 60. Then, the outer assembly 10 in which the diaphragm assembly 50 is assembled is inserted into the jig 60. As a result, as shown in FIG. 7, the outer assembly 10 and the inner assembly 30 are accurately assembled in the jig 60 so as to be coaxial with each other with the reference axis C as a reference. By removing the jig 60, the speaker 100 shown in FIG. 1 is manufactured.

When the outer assembly 10 and the inner assembly 30 are assembled, the inner magnet 31 is formed in the opening 17 of the outer assembly 10 formed on the lower side opposite to the upper side to which the diaphragm assembly 50 is connected. Is inserted. Then, the inner magnet 31 inserted from the lower side is fixed. As described above, the method for manufacturing the speaker 100 according to the present embodiment includes the step of inserting the inner magnet 31 into the opening 17 formed in the outer assembly 10.

The specific configuration of the jig 60, the assembly method using the jig 60, and the like are not limited, and any configuration and assembly method may be adopted. For example, the outer assembly 10 may be supported by the jig 60, and the inner assembly 30 may be inserted into the jig 60. Of course, both the outer assembly 10 and the inner assembly 30 may be supported by the jig 60.

By manufacturing the speaker 100 using the jig 60, the width of the magnetic gap becomes uniform in the circumferential direction, and it becomes possible to realize extremely high output characteristics and acoustic characteristics.

The outer assembly 10 and the inner assembly 30 may be assembled without using the jig 60. Further, in the other steps described above, a jig that guarantees the coaxial position may be appropriately used.

Note that in FIG. 7, the leader line 55 is not shown. The lead wire 55 is pulled out through, for example, a groove for pulling out formed in the housing 11 or the inner yoke 33. Alternatively, a space for pulling out the lead wire 55 may be formed between the housing 11 and the inner yoke 33. In addition, an arbitrary configuration for pulling out the lead wire 55 may be adopted.

Further, the magnetizing directions illustrated in FIGS. 1, 2 and 5 to 7 are merely examples, and if the magnetizing direction of the outer magnet 12 and the magnetizing direction of the inner magnet 31 are opposite to each other. Good. That is, the outer magnet 12 may be magnetized so that the upper side becomes the north pole and the lower side becomes the south pole. In this case, the inner magnet 31 is magnetized so that the upper side becomes the S pole and the lower side becomes the N pole.

The manufacturing method of the speaker 100 is not limited to the method described with reference to FIGS. 4 to 7. For example, the diaphragm assembly 50, the outer assembly 10, and the inner assembly 30 shown in FIG. 2 are individually formed. After that, the outer assembly 10, the inner assembly 30, and the diaphragm assembly 50 may be assembled so that the voice coil 52 is arranged in the magnetic gap between the outer assembly 10 and the inner assembly 30.

In addition, for example, the inner magnet 31 is arranged inside the outer magnet 12 via a gap, and the magnetizing direction of the outer magnet 12 and the magnetizing direction of the inner magnet 31 are opposite to each other. Any manufacturing method may be employed, including the step of assembling the outer assembly 10 and the inner assembly 30.

As described above, in the speaker 100 according to the present embodiment, the inner magnet 31 magnetized in the direction opposite to the outer magnet 12 is arranged inside the ring-shaped outer magnet 12 via the gap G1. This makes it possible to realize a speaker 100 having a strong magnetic circuit.

Electric-acoustic converters (speakers) have multiple basic structures and methods, but electrodynamic speakers are widely used for both consumer and commercial use due to the sound pressure generated and ease of realization. .. The basic structure of the electrokinetic speaker is a magnetic circuit using permanent magnets, a diaphragm, and a voice coil that is suspended in the magnetic gap (attaching to the diaphragm is a direct method and bobbin. It doesn't matter if there is a method through it).

When an electric signal flows through the voice coil, the voice coil moves according to Fleming's left-hand rule. This moving force becomes stronger in proportion to the magnetic flux density in the magnetic gap. When focusing on the configuration of the magnetic circuit here, either of the two types of methods, the internal magnetic type and the external magnetic type, as described in Patent Documents 1 and 2, is often adopted.

Here, the inventor has repeatedly considered the use of both the inner magnet type and the outer magnet type configurations for the purpose of obtaining a stronger magnetic flux density. When the inner magnet type and the outer magnet type are used together, the parallel positional relationship between the two magnets with respect to the magnetic gap is at the same position in order to suppress the thickness of the entire magnetic circuit. It is advantageous that the magnetizing directions are opposite to each other.

When this configuration is adopted, the process of magnetizing after assembling the entire speaker and the magnetic circuit becomes very difficult. Therefore, at least one permanent magnet needs to be assembled after magnetization. In addition, it is necessary to fix the lead wire of the voice coil to the terminal plate after assembling the diaphragm. It is likely to cause a decrease in magnetic flux density due to magnetism.

As a result of such examination, the inventor newly devised each technology described above. That is, an outer magnet 12 having a different magnetizing direction and an inner magnet 31 are arranged on the back surface of the diaphragm 51. At this time, the outer assembly 10 including the outer magnet 12 and the inner assembly 30 including the inner magnet 31 are configured as separate bodies. As a result, assembly after magnetizing the permanent magnet becomes feasible.

By mounting two permanent magnets with different magnetizing directions, the magnetic circuit becomes stronger than the one using one magnet, and sensitivity, low-frequency braking, etc. are improved. Further, when an attempt is made to obtain a magnetic force equivalent to that of one magnet, the magnetic gap can be widened and the risk of abnormal noise due to a voice coil collision can be reduced. Further, by making each magnet thinner, it is possible to make the speaker thinner and smaller while achieving the same magnetic flux density.

Further, in the state before assembling the inner assembly 30, a sufficient space for performing work such as forming and fixing of the lead wire 55 when inputting a signal from the outside to the voice coil 52 can be secured. As a result, the lead wire 55 can be routed from the side opposite to the diaphragm 51 to the outside of the magnetic circuit.

As a result, the workability for pulling out the leader wire 55 is improved, and the extra length of the leader wire 55 can be set to an appropriate value. Become. Further, since the reduction of the risk of contact with other parts can be reduced, it is possible to improve quality problems such as generation of abnormal noise and disconnection of the voice coil 52.

Also, since a strong magnetic circuit can be realized by using this technology, it is possible to reduce the amount (size) of magnets required to achieve the desired magnetic flux density. Therefore, since it is possible to increase the diameter of the through hole 35 formed by cutting the inner magnet 31, it is possible to increase the designable range of the through hole 35. As a result, the sound related to the back pressure of the diaphragm 51 can be adjusted to a more suitable one, and the acoustic characteristics can be improved.

By using this technology, it is possible to realize further miniaturization of small speakers such as earphones and headphones, improvement of acoustic characteristics, improvement of output characteristics, and the like. Of course, this technology can be applied not only to small speakers but also to any medium-sized or large-sized speaker. For example, it is possible to realize a speaker having high acoustic characteristics and high output characteristics while having the same size as a conventionally used speaker.

<Second embodiment>
The speaker of the second embodiment which concerns on this technique will be described. In the following description, the description of the parts similar to the configuration and operation in the speaker 100 described in the above embodiment will be omitted or simplified.

FIG. 8 is a schematic cross-sectional view showing a configuration example of the speaker 200 according to the present embodiment. FIG. 9 is a schematic cross-sectional view showing each of the outer assembly 210, the inner assembly 230, and the diaphragm assembly 250 included in the speaker 200 individually.

In the present embodiment, the diaphragm ring 253 of the diaphragm assembly 250 is made of a magnetic material and magnetized. That is, the permanent magnet constitutes the diaphragm ring 253. The specific magnetic material and the like constituting the diaphragm ring 253 are not limited.

As shown in FIG. 8, the diaphragm ring 253 is magnetized in the direction opposite to that of the outer magnet 212 along the axial direction of the reference axis C. That is, the diaphragm ring 253 is magnetized in the same direction as the inner magnet 231. The diaphragm ring 253 is then connected to the upper side of the housing 211 of the outer assembly 210. In this embodiment, the diaphragm ring 253 corresponds to a support magnet.

As a method for manufacturing the speaker 200 according to the present embodiment, for example, the diaphragm assembly 250, the outer assembly 210, and the inner assembly 230 shown in FIG. 9 are individually formed. That is, the diaphragm ring 253 of the diaphragm assembly 250, the outer magnet 212 of the outer assembly 210, and the inner magnet 231 of the inner assembly 230 are individually magnetized.

Then, the outer assembly 210 and the diaphragm assembly 250 are assembled, and then the inner assembly 230 is assembled. In each assembly process, a jig may be used for the purpose of preventing misalignment. Soldering is performed after the outer assembly 210 and the diaphragm assembly 250 are assembled.

FIG. 10 is a schematic diagram showing the distribution of the magnetic flux density in the magnetic gap. In FIG. 10, the distribution on one side (right side) of the cross section having a symmetrical shape with respect to the reference axis C is shown.

FIG. 10A shows the distribution of the speaker 200 according to the present embodiment when the diaphragm ring 253 made of a permanent magnet is used. FIG. 10B shows the distribution when the diaphragm ring 290 made of brass is used. In FIGS. 10A and 10B, the strength of the magnetic flux density is expressed by the shade of the gray color, and the lighter the gray color (closer to white), the stronger the magnetic flux density.

As shown in FIG. 10, by using a diaphragm ring 253 made of a permanent magnet on the outer plate 213, it is possible to further increase the amount of magnetic flux in the magnetic gap. Further, in the vicinity of the magnetic gap, it is possible to improve the symmetry of the distribution of the magnetic flux density between the diaphragm 251 side (upper side) and the terminal plate 214 side (lower side). As a result, the magnetic flux density can be kept uniform over the entire range of motion of the voice coil 252 that moves in the vertical direction.

<Other Embodiments>
The present technology is not limited to the embodiments described above, and various other embodiments can be realized.

FIG. 11 is a schematic cross-sectional view showing a configuration example of a speaker according to another embodiment. As shown in FIGS. 11A and 11B, the shape of the housing 311 of the outer assembly 310 is such that it covers only the outer peripheral side of the outer magnet 312. Then, an outer yoke 329 for the outer magnet 312 may be provided on the lower side of the outer magnet 312. This makes it possible to improve the magnetic permeability between the outer magnet 312 and the yoke under the inner magnet 331.

When the outer yoke 329 is provided as shown in FIGS. 11A and 11B, when the outer assembly 310 is formed, the outer yoke 329 of the metal portion is exposed to the outside. When the inner assembly 330 is formed, the inner yoke 333 of the metal portion is exposed to the outside.

Therefore, when assembling the outer assembly 310 and the inner assembly 330, the outer yoke 329 and the inner yoke 333 can be connected by welding. As a result, it is possible to increase the strength of the connecting portion between the outer assembly 310 and the inner assembly 330, and it is possible to improve the durability of the speaker.

Note that in FIGS. 11A and 11B, the outer yoke 329 and the inner yoke 333 are integrally shown as a state after welding. That is, the illustration of the welded portion is omitted. The position of the welded portion is not limited and may be arbitrarily designed. Of course, the method of connecting the outer yoke 329 and the inner yoke 333 is not limited to welding.

Further, the inner yoke 333 may be provided with a portion that functions as the outer yoke 329 after assembly. That is, the outer yoke 329 (the portion that functions as the outer yoke 329 after assembly) may be integrally configured with the inner yoke 333 on the outer peripheral side of the inner yoke 333 with the reference axis C as the center.

FIG. 12 is a schematic diagram showing the distribution of the magnetic flux density in the magnetic gap. FIG. 12A shows the distribution when the outer yoke 329 is used (the housing 311 on the outer peripheral portion is not shown). FIG. 12B shows the distribution when the outer yoke 329 is not used and the outer magnet 312 is supported by the housing 311.

Similar to FIGS. 10A and 10B, the strength of the magnetic flux density is expressed by the shade of gray color, and the lighter the gray color (closer to white), the stronger the magnetic flux density.

As shown in FIG. 12, by using the outer yoke 329, it is possible to further increase the amount of magnetic flux in the magnetic gap. Further, the magnetic flux density can be kept uniform in the vicinity of the magnetic gap.

FIG. 13 is a schematic diagram showing a configuration example of the speaker unit 400 according to another embodiment. As shown in FIG. 13, it is also possible to share and arrange the outer magnets 412 with respect to the plurality of inner magnets 431.

For example, a plurality of holes 471 are formed in the plate-shaped magnet part 470. Then, an inner magnet 431 is arranged for each hole 471 so that a magnetic gap MG is formed. A voice coil (not shown) is arranged in the magnetic gap between the hole 471 and the inner magnet 431. Therefore, the number of holes 471, the number of inner magnets 431, and the number of voice coils are equal to each other.

The plate-shaped magnet component 470 functions as the outer magnet 412 described above for each inner magnet 431. By using this technology, it is possible to easily realize a speaker unit 400 having a plurality of voice coils and having a planar shape. Further, by realizing the magnet component 470 with a bendable component, it is possible to install the speaker unit 400 on a curved surface.

Of course, a magnetic component that functions as an outer plate or an outer yoke may be added to the plate-shaped magnet component 470. Alternatively, the plate-shaped magnet component 470 may realize the function of the outer plate and the function of the outer yoke.

As the diaphragm, a single diaphragm may be used. That is, a single diaphragm may be shared by a plurality of voice coils. Alternatively, a diaphragm may be provided for each voice coil.

The characteristics of the inner magnets 431 arranged in each hole 471 do not have to be the same. Further, the winding diameters and the like of the voice coils arranged in each hole 771 do not have to be the same. That is, speakers having different output characteristics and acoustic characteristics may be configured in each hole 471.

Further, the inner magnet 431 and the voice coil are not necessarily arranged at equal intervals, such as arranging the inner magnet 431 and the voice coil according to the shape of the natural vibration of the diaphragm. That is, it is possible to configure a desired number of speakers having desired characteristics at a desired position.

In the above, as shown in FIG. 1 and the like, a through hole 35 extending in the axial direction was formed in the inner assembly 30. Not limited to this, the present technology can be applied even when the through hole 35 is not formed. For example, this technique can be applied even when a disk-shaped inner magnet 31 is used instead of a ring-shaped one.

In the above, the case where the lead wire of the voice coil is pulled out from the side opposite to the side to which the diaphragm assembly is connected is taken as an example. The lead wire of the voice coil may be drawn out from the side to which the diaphragm assembly is connected.

Each configuration of the speaker, outer assembly, inner assembly, diaphragm assembly, etc., each step of the speaker manufacturing method, etc. described with reference to each drawing is only one embodiment, and is within the scope of the present technology. It can be transformed arbitrarily. That is, other arbitrary configurations, other methods, etc. for implementing the present technology may be adopted.

In the present disclosure, "center", "center", "uniform", "equal", "same", "orthogonal", "parallel", "symmetrical", "extended", "axial", "cylindrical", "cylindrical", "ring", and "circle". Concepts that define shape, size, positional relationship, state, etc., such as "ring shape," are "substantially centered," "substantially centered," "substantially uniform," "substantially equal," and "substantially the same." "Substantially orthogonal" "substantially parallel" "substantially symmetric" "substantially extending" "substantially axial" "substantially cylindrical" "substantially cylindrical" "substantially cylindrical" The concept includes a ring shape, a substantially ring shape, and the like.

For example, "perfectly centered", "perfectly centered", "perfectly uniform", "perfectly equal", "perfectly identical", "perfectly orthogonal", "perfectly parallel", "perfectly symmetric", "perfectly extending", "perfectly extending" Includes states included in a predetermined range (for example, ± 10% range) based on "axial direction", "completely cylindrical shape", "completely cylindrical shape", "completely ring shape", "completely annular shape", etc. Is done.

It is also possible to combine at least two feature parts among the feature parts related to the present technology described above. That is, the various feature portions described in each embodiment may be arbitrarily combined without distinction between the respective embodiments. Further, the various effects described above are merely examples and are not limited, and other effects may be exhibited.

In addition, this technology can also adopt the following configurations.
(1)
An outer magnet having a ring shape and magnetized along the axial direction of the ring shape,
With an inner magnet that has a circular outer shape when viewed from the axial direction of the outer magnet, is magnetized in the direction opposite to that of the outer magnet along the axial direction, and is arranged inside the outer magnet through a gap. A speaker equipped with.
(2) The speaker according to (1).
The inner magnet is a speaker having a ring shape having an axial direction equal to that of the outer magnet.
(3) The speaker according to (2), further
The outer component including the outer magnet and
An inner component portion that includes the inner magnet and forms a magnetic gap with the outer component portion,
A speaker including a coil arranged in the magnetic gap and a diaphragm component portion including a diaphragm.
(4) The speaker according to (3).
The outer component portion has an opening that is orthogonal to the axial direction and has a diameter larger than the outer diameter of the inner magnet.
The inner magnet is a speaker that is inserted and fixed in the opening.
(5) The speaker according to (4).
In the axial direction, the side to which the diaphragm component is connected to the outer component is the first side, and the side opposite to the first side is the second side.
The opening is a speaker configured on the second side of the outer component portion.
(6) The speaker according to (4) or (5).
The lead wire of the coil is a speaker that is pulled out through the opening.
(7) The speaker according to any one of (3) to (6).
The position of the central axis of the outer magnet, the position of the central axis of the inner magnet, and the position of the central axis of the coil are configured to be equal to each other.
The inner component portion is a speaker having a through hole extending along the axial direction at the position of the central axis of the inner magnet.
(8) The speaker according to any one of (3) to (7).
In the axial direction, the side to which the diaphragm component is connected to the outer component is the first side, and the side opposite to the first side is the second side.
The inner component portion is a speaker having an inner yoke magnetically connected to the second side of the inner magnet.
(9) The speaker according to (8).
The inner yoke has a first portion corresponding to the coil and a second portion corresponding to the inner magnet when viewed from the axial direction.
A speaker in which the thickness of the first portion is smaller than the thickness of the second portion.
(10) The speaker according to (8) or (9).
The outer component portion is a speaker having an outer yoke magnetically connected to the second side of the outer magnet.
(11) The speaker according to (10).
A speaker in which the inner yoke and the outer yoke are connected by welding.
(12) The speaker according to any one of (3) to (11).
The diaphragm component portion is a speaker that supports the diaphragm and has a support magnet that is magnetized in the direction opposite to that of the outer magnet along the axial direction.
(13)
A step of forming an outer component portion having a ring shape and including an outer magnet magnetized along the axial direction of the ring shape.
A step of forming an inner component portion having a circular outer shape having a diameter smaller than the inner diameter of the outer magnet and including an inner magnet magnetized along the axial direction of the circular shape.
The outer component is arranged so that the inner magnet is arranged inside the outer magnet through a gap, and the magnetizing direction of the outer magnet and the magnetizing direction of the inner magnet are opposite to each other. A method of manufacturing a speaker including a step of assembling a portion and the inner component portion.
(14) The speaker manufacturing method according to (13).
The inner magnet has a ring shape having a diameter smaller than that of the outer magnet, and the step of forming the inner component portion is provided with a through hole so as to extend along the axial direction at the position of the central axis of the inner magnet. A method of manufacturing a speaker that includes a step of forming.
(15) The method for manufacturing a speaker according to (13) or (14).
The step of assembling the outer component portion and the inner component portion is performed by opening the outer component portion on the side opposite to the side to which the diaphragm component portion including the coil and the diaphragm is connected. A method of manufacturing a speaker that includes the step of inserting a magnet.
(16) The method for manufacturing a speaker according to any one of (13) to (15).
The step of assembling the outer component portion and the inner component portion is performed by a jig for making the axial direction of the outer magnet equal to the axial direction of the inner magnet, and at least one of the outer component portion or the inner component portion. A method of manufacturing a speaker that includes steps to support.
(17) The method for manufacturing a speaker according to any one of (13) to (16), and further.
Steps to form the diaphragm parts including the coil and diaphragm,
The outer component portion, the inner component portion, and the step of assembling the diaphragm component portion are provided so that the coil is arranged in the magnetic gap between the outer component portion and the inner component portion. How to manufacture a speaker.
(18) The method for manufacturing a speaker according to any one of (13) to (17), and further.
It includes a step of forming a diaphragm component including a coil and a diaphragm.
The step of forming the outer component portion is
The step of assembling the unmagnetized outer part and the diaphragm part,
A step of assembling the unmagnetized outer component portion and the diaphragm component portion is followed by a step of magnetizing the unmagnetized outer magnet.
In the step of assembling the outer component portion and the inner component portion, the diaphragm component portion is assembled so that the coil is arranged in the magnetic gap between the outer component portion and the inner component portion. A method for manufacturing a speaker, which comprises a step of assembling the inner part with respect to the outer part.
(19) The speaker manufacturing method according to (18).
The step of forming the outer component portion is between the step of assembling the unmagnetized outer component portion and the diaphragm component portion and the step of magnetizing the unmagnetized outer magnet. A method for manufacturing a speaker, which comprises a step of fixing a leader wire of the coil of the diaphragm component portion by soldering.
(20) The speaker manufacturing method according to (17).
Assuming that the side to which the diaphragm component is connected to the outer component is the first side and the side opposite to the first side is the second side.
The step of forming the outer component portion includes the step of arranging the outer yoke on the second side of the outer magnet.
The step of forming the inner component portion includes a step of arranging the inner yoke on the second side of the inner magnet.
A method for manufacturing a speaker, wherein the step of assembling the outer component portion and the inner component portion includes a step of connecting the outer yoke and the inner yoke by welding.

C ... Reference axis G1, G2 ... Gap MG ...

Magnetic gap

10, 210, 310 ...

Outer assembly

12, 212, 312, 412 ... Outer magnet 17 ... Opening 20 ... Outer magnet (ferromagnetic material) in unmagnetized state
25 ... Outer assembly in

unmagnetized state

30, 230, 330 ...

Inner assembly

31, 231, 331, 431 ...

Inner magnet

33, 333 ... Inner yoke 35 ... Through

hole

50, 250 ...

Diaphragm assembly

51, 251 ...

Diaphragm

52, 252 ...

Voice coil

53, 253 ... Diaphragm ring 60 ...

Jig

100, 200 ... Speaker 329 ... Outer yoke 400 ... Speaker unit

Claims

An outer magnet having a ring shape and magnetized along the axial direction of the ring shape,
With an inner magnet that has a circular outer shape when viewed from the axial direction of the outer magnet, is magnetized in the direction opposite to that of the outer magnet along the axial direction, and is arranged inside the outer magnet through a gap. A speaker equipped with.
The speaker according to claim 1.
The inner magnet is a speaker having a ring shape having an axial direction equal to that of the outer magnet.
The speaker according to claim 2, further
The outer component including the outer magnet and
An inner component portion that includes the inner magnet and forms a magnetic gap with the outer component portion,
A speaker including a coil arranged in the magnetic gap and a diaphragm component portion including a diaphragm.
The speaker according to claim 3.
The outer component portion has an opening that is orthogonal to the axial direction and has a diameter larger than the outer diameter of the inner magnet.
The inner magnet is a speaker that is inserted and fixed in the opening.
The speaker according to claim 4.
In the axial direction, the side to which the diaphragm component is connected to the outer component is the first side, and the side opposite to the first side is the second side.
The opening is a speaker configured on the second side of the outer component portion.
The speaker according to claim 4.
The lead wire of the coil is a speaker that is pulled out through the opening.
The speaker according to claim 3.
The position of the central axis of the outer magnet, the position of the central axis of the inner magnet, and the position of the central axis of the coil are configured to be equal to each other.
The inner component portion is a speaker having a through hole extending along the axial direction at the position of the central axis of the inner magnet.
The speaker according to claim 3.
In the axial direction, the side to which the diaphragm component is connected to the outer component is the first side, and the side opposite to the first side is the second side.
The inner component portion is a speaker having an inner yoke magnetically connected to the second side of the inner magnet.
The speaker according to claim 8.
The inner yoke has a first portion corresponding to the coil and a second portion corresponding to the inner magnet when viewed from the axial direction.
A speaker in which the thickness of the first portion is smaller than the thickness of the second portion.
The speaker according to claim 8.
The outer component portion is a speaker having an outer yoke magnetically connected to the second side of the outer magnet.
The speaker according to claim 10.
A speaker in which the inner yoke and the outer yoke are connected by welding.
The speaker according to claim 3.
The diaphragm component portion is a speaker that supports the diaphragm and has a support magnet that is magnetized in the direction opposite to that of the outer magnet along the axial direction.
A step of forming an outer component portion having a ring shape and including an outer magnet magnetized along the axial direction of the ring shape.
A step of forming an inner component portion having a circular outer shape having a diameter smaller than the inner diameter of the outer magnet and including an inner magnet magnetized along the axial direction of the circular shape.
The outer component is arranged so that the inner magnet is arranged inside the outer magnet through a gap, and the magnetizing direction of the outer magnet and the magnetizing direction of the inner magnet are opposite to each other. A method of manufacturing a speaker including a step of assembling a portion and the inner component portion.
The speaker manufacturing method according to claim 13.
The inner magnet has a ring shape having a diameter smaller than that of the outer magnet, and the step of forming the inner component portion is provided with a through hole so as to extend along the axial direction at the position of the central axis of the inner magnet. A method of manufacturing a speaker that includes a step of forming.
The speaker manufacturing method according to claim 13.
The step of assembling the outer component portion and the inner component portion is performed by opening the outer component portion on the side opposite to the side to which the diaphragm component portion including the coil and the diaphragm is connected. A method of manufacturing a speaker that includes the step of inserting a magnet.
The speaker manufacturing method according to claim 13.
The step of assembling the outer component portion and the inner component portion is performed by a jig for making the axial direction of the outer magnet equal to the axial direction of the inner magnet, and at least one of the outer component portion or the inner component portion. A method of manufacturing a speaker that includes steps to support.
The method for manufacturing a speaker according to claim 13, further
Steps to form the diaphragm parts including the coil and diaphragm,
The outer component portion, the inner component portion, and the step of assembling the diaphragm component portion are provided so that the coil is arranged in the magnetic gap between the outer component portion and the inner component portion. How to manufacture a speaker.
The method for manufacturing a speaker according to claim 13, further
It includes a step of forming a diaphragm component including a coil and a diaphragm.
The step of forming the outer component portion is
The step of assembling the unmagnetized outer part and the diaphragm part,
A step of assembling the unmagnetized outer component portion and the diaphragm component portion is followed by a step of magnetizing the unmagnetized outer magnet.
In the step of assembling the outer component portion and the inner component portion, the diaphragm component portion is assembled so that the coil is arranged in the magnetic gap between the outer component portion and the inner component portion. A method for manufacturing a speaker, which comprises a step of assembling the inner part with respect to the outer part.
The method for manufacturing a speaker according to claim 18.
The step of forming the outer component portion is between the step of assembling the unmagnetized outer component portion and the diaphragm component portion and the step of magnetizing the unmagnetized outer magnet. A method for manufacturing a speaker, which comprises a step of fixing a leader wire of the coil of the diaphragm component portion by soldering.
The speaker manufacturing method according to claim 17.
Assuming that the side to which the diaphragm component is connected to the outer component is the first side and the side opposite to the first side is the second side.
The step of forming the outer component portion includes a step of arranging the outer yoke on the second side of the outer magnet.
The step of forming the inner component portion includes a step of arranging the inner yoke on the second side of the inner magnet.
A method for manufacturing a speaker, wherein the step of assembling the outer component portion and the inner component portion includes a step of connecting the outer yoke and the inner yoke by welding.